Gulfstream (jet)

To train Space Shuttle pilots in landing
the vehicle, prior to making their first spaceflight, NASA uses a modified
Gulfstream 2 executive jet. The cockpit has been divided into two-with Shuttle
controls on the left, and normal Gulfstream controls on the right. The flight
dynamics of the Shuttle were calculated before the Shuttle actually flew,
and the Gulfstream 2 trainer modified accordingly. The calculations proved
to be so accurate that very few changes have been made since the Shuttle
entered service.